No abstract

No abstract

The development of a wing tip vortex under the effect of synthetic jet actuation was examined qualitatively using Laser smoke flow visualization and qualitatively using hot-wire anemometry at a chord Reynolds number, , of 80 000. Fluidic excitation was found to alter the formation of the wing tip vortex by reducing the axial vorticity by nearly 30% which resulted in a decreased cross-flow velocity and consequently an increased diffusion in the lateral direction outward the vortex center. The turbulence measured within the vortex core was found to intensify near the vortex center when the synthetic jet was operated which resulted in enhanced mixing and accelerated diffusion of the vortex as it developed downstream. Results of flow visualizations show that the wing tip vortex appeared to be responsive to low actuation frequencies and that turbulent diffusion in the vortex core was more pronounced at higher momentum coefficients. Downloaded by KUNGLIGA TEKNISKA HOGSKOLEN KTH on July 30, 2015 | http://arc.aiaa.org | ̅= Streamwise vorticity, = Radial distance from mean vortex axis, = Streamwise distance from wing quarter-chord location, = Spanwise direction distance from vortex center, = Vertical direction distance from vortex center, = Spanwise distance separating two measurement grid points in the direction, = Transcerse distance separating two measurement grid points in the direction,